PHP 修改和删除XML内容的原理和方法

旧城等待， 2022-07-15 17:38 163阅读 0赞

![示例][20161022152100857]

例如：

example.xml

<?xml version="1.0" encoding="utf-8"?>
    <root>
        <book id="1">
            <title>title1</title>
        </book>
        <book id="2">
            <title>title2</title>
        </book>
        <book id="3">
            <title>title3</title>
        </book>
        <book id="4">
            <title>title4</title>
        </book>
        <book id="5">
            <title>title5</title>
        </book>
    </root>

首先遍历一下该xml文档

<?php
    
        $doc = new DOMDocument();
        $doc->load('example.xml');
    
        $books = $doc -> getElementsByTagName("book");
        //遍历
        foreach ($books as $book) {
            echo $book->getAttribute('id')."-";
            echo $book->getElementsByTagName("title")->item(0)->nodeValue;
            echo "<br>";
        }

运行结果为：

1-title1  
2-title2  
3-title3  
4-title4  
5-title5

修改：

<?php
    
        $doc = new DOMDocument();
        $doc->load('example.xml');
    
        $books = $doc -> getElementsByTagName("book");
        //遍历
        foreach ($books as $book) {
            //将id=3的title设置为33333
            if($book->getAttribute('id')==3){
                echo $book->getAttribute('id')."-";
                echo $book->getElementsByTagName("title")->item(0)->nodeValue="33333";
                echo "<br>";
            }
        }
        //对文件做修改后，一定要记得重新sava一下，才能修改掉原文件
        $doc -> save('example.xml');

修改之后为：

<?xml version="1.0" encoding="utf-8"?>
    <root>
        <book id="1">
            <title>title1</title>
        </book>
        <book id="2">
            <title>title2</title>
        </book>
        <book id="3">
            <title>33333</title>
        </book>
        <book id="4">
            <title>title4</title>
        </book>
        <book id="5">
            <title>title5</title>
        </book>
    </root>

删除操作：

<?php
    
        $doc = new DOMDocument();
        $doc->load('example.xml');
    
        $root = $doc -> documentElement;//根标签   
        $books = $doc -> getElementsByTagName("book");
        //遍历
        foreach ($books as $book) {
            //将id=4的删除
            if($book->getAttribute('id')==4){
                $root->removeChild($book);
            }
        }
        //对文件做修改后，一定要记得重新sava一下，才能修改掉原文件
        $doc -> save('example.xml');

删除后的结果为：

<?xml version="1.0" encoding="utf-8"?>
    <root>
        <book id="1">
            <title>title1</title>
        </book>
        <book id="2">
            <title>title2</title>
        </book>
        <book id="3">
            <title>33333</title>
        </book>
    
        <book id="5">
            <title>title5</title>
        </book>
    </root>

[20161022152100857]: /images/20220715/0af1f13df5b44f9cbca421f3f0db0f7b.png